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99999021 = 333798911
BaseRepresentation
bin1011111010111…
…01110100101101
320222011110212110
411331131310231
5201044432041
613531154233
72322656223
oct575356455
9228143773
1099999021
11514a0821
12295a5979
1317943225
14d3d0b13
158ba4516
hex5f5dd2d

99999021 has 8 divisors (see below), whose sum is σ = 133729024. Its totient is φ = 66467520.

The previous prime is 99998999. The next prime is 99999043. The reversal of 99999021 is 12099999.

It is an interprime number because it is at equal distance from previous prime (99998999) and next prime (99999043).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99999021 - 223 = 91610413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48445 + ... + 50466.

It is an arithmetic number, because the mean of its divisors is an integer number (16716128).

Almost surely, 299999021 is an apocalyptic number.

It is an amenable number.

99999021 is a deficient number, since it is larger than the sum of its proper divisors (33730003).

99999021 is a wasteful number, since it uses less digits than its factorization.

99999021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99251.

The product of its (nonzero) digits is 118098, while the sum is 48.

The square root of 99999021 is about 9999.9510498802. The cubic root of 99999021 is about 464.1573686512.

The spelling of 99999021 in words is "ninety-nine million, nine hundred ninety-nine thousand, twenty-one".

Divisors: 1 3 337 1011 98911 296733 33333007 99999021